Dry cleaning system for workpieces

Abstract

A system for dry cleaning workpieces by removing solid and/or liquid particles adhereing thereto with a gaseous medium by suction. To this end, a suction mold encloses the workpieces on all sides while serving as a guiding device whose inner contour follows the outer contour of the workpiece. The cleaning medium flows to the gaps between the suction mold and the workpiece via feed slots and/or feed boreholes of the suction mold. Gaps, medium feed slots and/or medium feed boreholes are formed, arranged and dimensioned so that the flowing medium has a velocity of greater than 20 m/s everywhere on the surface of the workpiece, and the solid and/or liquid particles adhereing thereto are carried away. The suction slot, through which the flowing medium is removed by suction, and the suction duct which is connected thereto and which leads to the suction unit, has larger cross-sections than the sum of the cross-sections of all the gaps between the workpiece and the suction mold, and also the sum of the cross-sections of the medium feed slots and/or of the medium feed boreholes. The sum of the cross-sections of the medium feed slots and or of the medium feed boreholes corresponds to 0.9 to 1.2 times the sum of the cross-sections of all the gaps between the workpieces and the suction molds.

1. System for dry cleaning of work pieces with a gaseous medium, by means of suctioning off solid or liquid particles that adhere to them, having a suction channel ( 9 ) that leads to a suction unit (i 0 ), and a guide device that precedes the suction channel, by means of which the suction stream in the region of the surface of the work piece ( 2 ) is guided in such a manner that a flow is formed at the surface of the work piece, which entrains the adhering solid or liquid particles, whereby the guide device is configured as a suction mold (I) that surrounds the work piece on all sides, the inside arcuate contours ( 4 ) of which follows the outside contours of the work piece ( 5 ) and leaves defined gaps ( 3 ) which are a surface volume of a space inbetween wall of said arcuate contours,
 wherein a gaseous medium flows to the gaps by way of feed slots ( 6 ) and feed bores ( 7 ) in the suction mold, 
 whereby the gaps ( 3 ), and the medium feed slots ( 6 ) and medium feed bores ( 7 ), are configured, arranged, and sized in such a manner that the flow velocity of the gaseous medium is more than 20 m/s within said arcuate contours and said gap; 
 wherein the suction channel ( 9 ) is connected with the interior of the suction mold ( 1 ) by way of a suction slot ( 8 ) that extends at least substantially over an entire length of the suction mold which has the work piece 
 wherein the suction slot ( 8 ) and the adjoining suction channel ( 9 ) are each of larger cross-sections than the sum of the cross-sections of all of the gaps ( 3 ) and the sum of the cross-sections of the feed slots ( 6 ) and feed bores ( 7 ) for the gaseous medium; 
 wherein the sum of the cross-sections of the feed slots ( 6 ) and feed bores ( 7 ) for the gaseous medium corresponds to 0.9 to 1.2 times the sum of all the gaps ( 3 ) 
 wherein the contours ( 4 ) of the suction mold (I) follow the contours ( 5 ) of the work piece ( 2 ) at a spacing of between 1 mm and 5 mm. 
 
   
   
     2. The system as recited in  claim 1 ,
 wherein the suction unit ( 10 ) has a flat characteristic and works at a partial vacuum of 50 mbar to 100 mbar. 
 
   
   
     3. The system as recited in  claim 1 ,
 wherein the suction mold ( 1 ) consists of two halves ( 1   a ,  1   b ). 
 
   
   
     4. The system as recited in  claim 3 ,
 wherein the suction mold ( 1 ) is surrounded by a noise protection hood ( 21 ) during the cleaning process. 
 
   
   
     5. The system as recited in  claim 4 ,
 wherein the noise protection hood ( 21 ) consists of two halves ( 21   a ,  21   b ), which are mounted on the movable pusher plates ( 12 ,  13 ). 
 
   
   
     6. The system as recited in  claim 5 ,
 wherein the noise protection hood ( 21 ) permits the inflow of a gaseous medium. 
 
   
   
     7. The system as recited in  claim 1 ,
 wherein the suction mold ( 1 ) or the suction mold halves ( 1   a ,  1   b ) are mounted on pusher plates ( 12 ,  13 ) that are moved relative to the work piece ( 2 ), held by holders ( 18   a ,  18   b ). 
 
   
   
     8. The system as recited in  claim 7 ,
 wherein the pusher plates ( 12 ,  13 ) have recesses ( 14   a ,  14   b , and  15   a ,  15   b ) that permit them to be moved completely into one another and merely leave the suction slot ( 8 ) free. 
 
   
   
     9. The system as recited in  claim 7 ,
 wherein the pusher plates ( 12 ,  13 ) are guided on rails ( 16   a ,  16   b ). 
 
   
   
     10. The system as recited in  claim 7 ,
 wherein setting devices ( 17   a ,  17   b ) are switched synchronously in order to move the pusher plates ( 12 ,  13 ) with the suction mold halves ( 1   a ,  1   b ) towards the work piece ( 2 ) and the suction slot( 8 ) synchronously, and thereby position the suction mold halves symmetrically to the work piece.